Thursday

January 19, 2017
Total # Posts: 2,596

**American Government**

yup, 100% correct. thanks anonymous

*November 15, 2016*

**Physics - Buoyant Force Question**

Find the buoyant force on a helium balloon in air (Standard Pressure and Temperature) if the balloon is spherical with diameter 12.0 cm.

*November 11, 2016*

**Physics - Angular Speed Question**

A merry-go-round can be modeled as a disk with radius 2.5 meters and mass of 150 kg. For this problem, assume the density is uniform. It is initially rotating at 2.0 rad/sec. Two children of mass 30 kg and 40 kg hop onto the merry-go-round and stay near the edge. What is the ...

*November 11, 2016*

**Physics Question**

Find the escape speed from (a) the Sun, (b) a white dwarf star with one solar mass (same as the Sun) and radius 10,000 km, (c) a neutron star of 2.0 solar masses and radius of 10.0 km, and finally (d) a star with 2 solar masses and radius 5930 m. Comment on the speed of part (d).

*November 11, 2016*

**Physics - Tension Question**

A uniform bar of mass 12 kg and length 1.4 m is held by a hinge on a vertical wall. A string is attached to the end so that the bar is in mechanical equilibrium. The angle between the bar and the string is 25o. Find the tension in the string.

*November 11, 2016*

**Math**

right^^^^

*November 9, 2016*

**MATH**

Consider F and C below. F(x, y, z) = 2xz + y2 i + 2xy j + x2 + 15z2 k C: x = t2, y = t + 2, z = 3t ? 1, 0 ? t ? 1 (a) Find a function f such that F = ?f. f(x, y, z) = x2z+xy2+5z3+C Correct: Your answer is correct. (b) Use part (a) to evaluate C ?f · dr along the given ...

*November 9, 2016*

**American Government**

B C B

*November 7, 2016*

**Physics - Gravitation**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. How much energy did the spacecraft expend going from the 2750 km orbit to a 210 km ...

*November 5, 2016*

**Physics Gravitation Question**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. A. Find the local acceleration due to gravity at the mean surface of Vesta. What is the...

*November 5, 2016*

**Physics Gravitation Question**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. Find the local acceleration due to gravity at the mean surface of Vesta. What is the ...

*November 5, 2016*

**social studies**

it strengthened their resolve to fight

*November 4, 2016*

**social studies**

which statement correctly contrast the Lancaster turnpike with the national road 1. the Lancaster turnpike was a longer road 2. the national road required users to pay a toll to use it 3. the national road was a corduroy road 4. the Lancaster turnpike was limited to travel in ...

*November 4, 2016*

**Calc III**

Express the volume of the solid that the cylinder r = 4cos(theta) cuts out of the sphere of radius 4 centered at the origin with a triple integral in cylindrical coordinates. I have already found the intervals, but I cannot solve it. The bounds are -sqrt(16-r^2) < z < ...

*November 2, 2016*

**Calc**

Find the work done by the force field F(x, y, z) = y + z, x + z, x + y on a particle that moves along the line segment from (1, 0, 0) to (5, 2, 3).

*November 1, 2016*

**Calc**

Evaluate the line integral, where C is the given curve. C y^3 ds, C: x = t^3, y = t, 0 ? t ? 2

*November 1, 2016*

**Calc**

Evaluate the line integral, where C is the given curve. C z dx + x dy + y dz, C: x = t^4, y = t^5, z = t^4, 0 ? t ? 1

*November 1, 2016*

**la**

if you're for connexus academy , lun is correct

*November 1, 2016*

**chemistry**

Consider these reactions where M represents a generic metal 1. 2M(s) +6HCl(aq) --> 2MCl3(aq)+3H2(g) (deltaH)= -725.0 kj 2. HCl(g)-->HCl(aq) (deltaH)= -74.8kj 3. H2(g)+CL2(g) --> 2HCl(g) (deltaH)=-1845.0kj 4. MCL3(s) --> MCl3(aq) (deltaH)= -476.0kj Use the ...

*October 28, 2016*

**chemistry**

Given these reactions : X(s) + 1/2O2(g) --> XO(s) (Delta)H= -707.7 kj XCO3(s) --> XO(s)+CO2(g) (Delta)H= +381.9kj What is (delta)Hrxm for this reaction? X(s)+1/2 O2(g)+CO2(g) ---> XCO3(s) (Delta)H= ?

*October 28, 2016*

**chemistry**

Calculate the standard enthalpy change for the following reaction at 25 °C. H2O+C(graphite)(s) --> H2(g) +CO(g)

*October 28, 2016*

**chemistry**

The following equation is the balanced combustion reaction for C6H6: 2C6H6(L) + 15O2(g) --> 12CO2(g)+6H2O(L)+6543 kj If 7.700 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water?

*October 28, 2016*

**chemistry**

If the heat of combustion for a specific compound is -1180.0 kJ/mol and its molar mass is 40.91 g/mol, how many grams of this compound must you burn to release 114.50 kJ of heat?

*October 28, 2016*

**chemistry**

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using ...

*October 28, 2016*

**chemistry**

When a 8.00-g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 3.344 kJ·K–1, the temperature decreases by 0.400 K. Calculate the molar heat of solution of KBr.

*October 28, 2016*

**chemistry**

A researcher studying the nutritional value of a new candy places a 4.10-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.47 °C. If the heat capacity of the calorimeter is 33.90 kJ·K–1, ...

*October 28, 2016*

**chemistry**

At constant volume, the heat of combustion of a particular compound is –3947.0 kJ/mol. When 1.311 g of this compound (molar mass = 136.58 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 4.343 °C. What is the...

*October 28, 2016*

**chemistry**

Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 7.00 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP= 30.8 J/(K·mol) for Na(l) ...

*October 28, 2016*

**chemistry**

When 1367 J of heat energy is added to 44.1 g of hexane, C6H14, the temperature increases by 13.7 °C. Calculate the molar heat capacity of C6H14.

*October 28, 2016*

**chemistry**

An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 8305 J. What is the specific heat of the gas?

*October 28, 2016*

**chemistry**

If you combine 360.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

*October 28, 2016*

**Social Studies**

Mongoose is right

*October 28, 2016*

**Chemistry**

Draw the product(s) of the following reaction CH3-CH2-C(triple bond)C-CH2 ---------> ? (Na/NH3)

*October 27, 2016*

**Calc**

Use spherical coordinates. Evaluate Triple integral SSSE where E lies between the spheres x^2 + y^2 + z^2 = 25 and x^2 + y^2 + z^2 = 49 in the first octant.

*October 26, 2016*

**math**

Change from rectangular to cylindrical coordinates. (Let r ≥ 0 and 0 ≤ θ ≤ 2π.) (a) (3, −3, 2) (b) (−2, −2sqrt3, 5)

*October 26, 2016*

**calc**

Write the equations in cylindrical coordinates. (a) 3z = 2x^2 + 2y^2 (b) 7x^2 + 7y^2 = 4y

*October 25, 2016*

**Calc**

Find the rectangular coordinates of the point, whose cylindrical coordinates are given. (a) (4, π/4, 1) (x, y, z) = (b) (6, −π/3, 5) (x, y, z) =

*October 25, 2016*

**Calc**

Change from rectangular to cylindrical coordinates. (Let r ≥ 0 and 0 ≤ θ ≤ 2π.) (a) (3, −3, 2) (b) (−2, −2sqrt3, 5)

*October 25, 2016*

**Calc**

Write the equations in cylindrical coordinates. (a) 3z = 2x^2 + 2y^2 (b) 7x^2 + 7y^2 = 4y

*October 25, 2016*

**CALC**

Find the rectangular coordinates of the point, whose cylindrical coordinates are given. (a) (4, π/4, 1) (x, y, z) = (b) (6, −π/3, 5) (x, y, z) =

*October 25, 2016*

**Math**

Cheater! Do your own math. Cheating = Lazy. Work hard!

*October 20, 2016*

**Social Studies**

WRONG. Alexandria is wrong! Answers: 2. B 3. D I don't know the first answer though.

*October 20, 2016*

**Math**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**Math**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 19, 2016*

**Math**

Find center of mass of the lamina that occupies the region D and has the given density function ρ. D is the triangular region with vertices (0, 0), (2, 1), (0, 3); ρ(x, y) = 5(x + y) mass=30 Find center of mass

*October 19, 2016*

**math**

what is the solution to the following system? -2x-y=1 -4x-2y=-1

*October 19, 2016*

**CALC**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**CALC**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 19, 2016*

**SOCIAL STUDIES (CHECK answer)**

MS sue how does saying i agree help anyone

*October 19, 2016*

**Calc**

Find the mass and center of mass of the solid E with the given density function ρ. E is bounded by the parabolic cylinder z = 1 − y^2 and the planes x + 6z = 6, x = 0, and z = 0; ρ(x, y, z) = 4. m=? x, y, z=?

*October 19, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**math**

why do you need to tell everybody their location??? that makes no sense at all

*October 18, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 18, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 18, 2016*

**Calc**

Evaluate the triple integral. SSS(triple integral T 3x^2 dV where T is the solid tetrahedron with vertices (0, 0, 0), (1, 0, 0), (0, 1, 0), and (0, 0, 1)

*October 18, 2016*

**Calc**

Evaluate the following integral using three different orders of integration. *triple integral E (xz − y3) dV, where E = (x, y, z) | −1 ≤ x ≤ 3, 0 ≤ y ≤ 4, 0 ≤ z ≤ 3

*October 18, 2016*

**Calc**

Find the mass and center of mass of the lamina that occupies the region D and has the given density function ρ. D is the triangular region with vertices (0, 0), (2, 1), (0, 3); ρ(x, y) = 5(x + y) m=? (x,y)=?

*October 18, 2016*

**CALC**

Its wrong.

*October 18, 2016*

**Thermochemistry**

The given reaction was: 2C6H6(l)+15O2(g)=12CO2(g)+6H2O(g) dH rxn= -6278kJ

*October 17, 2016*

**Thermochemistry**

What volume of benzene (C6H6, d= 0.88g/ml, molar mass= 78.11g/mol) is required to produce 1.5x10^3 kJ of heat according to the following reaction? I just can't figure out what equation to use to solve this. Help, please?

*October 17, 2016*

**Physics Force and Friction question**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

*October 16, 2016*

**Physics**

You are in an elevator that is accelerating upwards at 2m/s^2. If your mass is 70kg, what is the normal force pushing on you by the floor of the elevator? A. 70N B. 690N C. 830N Please give the correct answer and an explanation as to why its correct.

*October 14, 2016*

**Physics**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

*October 14, 2016*

**Physics**

Multiple Choice. If all of the forces acting on an object an object are balanced (net force is zero), then: a. The object's speed will decrease b. The object's direction of motion can change, but its speed cannot C. The object is ecperiencing zero acceleration Please ...

*October 14, 2016*

**Physics**

Why is the joule-second (J*s) equivalent to kg*m^2/s ?

*October 14, 2016*

**physics**

A stone is thrown vertically upward at 23 m/s. How fast is it moving when it reaches 14 m?

*October 13, 2016*

**Social Studies**

Okay thank you so much!

*October 13, 2016*

**Social Studies**

Why did the Western Roman Empire fall? Thank you for helping me!

*October 13, 2016*

**Social Studies**

Okay thank you so much I really really appreciate it!

*October 13, 2016*

**Social Studies**

How might Greece's psychical features have affected the development of Greek trade, culture, and legacy? Thank you for the help

*October 13, 2016*

**Social Studies**

Okay, thank you so much, have a nice day/night!

*October 13, 2016*

**Social Studies**

______Introduced Europeans to Muslim inventions, such as the astrolabe that helped sailors navigate the seas. A) The Crusades(I pick this) B) The Reconquista C) The Vikings D) The Magna Carta Thank you for helping me!

*October 13, 2016*

**physics grade 11**

how do i figure out how fast a car is going when all i know is frequency?

*October 13, 2016*

**Math. please help**

-1/2 + 1/3 = Adding and subtracting fractions with rational numbers.

*October 12, 2016*

**History**

thx Sarah :)

*October 11, 2016*

**Calc**

Evaluate the integral by reversing the order of integration. (2 integrals) 0 to 8 cube root(y) to 2 8e^(x^4) dx dy

*October 11, 2016*

**Calc**

Evaluate the integral by reversing the order of integration. (2 integrations) 0 to 1 sqrt(x) to 1 8(y^3+1) dy dx

*October 11, 2016*

**Calc**

Evaluate the integral by reversing the order of integration.(2 integrals) 0 to 4 5ex2 dx dy 3y to 12

*October 11, 2016*

**Calculus**

Find the volume of the solid under the plane 3x + 3y − z = 0 and above the region bounded by y = x and y = x^4

*October 11, 2016*

**Calculus**

Find the volume of the given solid. Under the surface z = 7xy and above the triangle with vertices (1, 1), (4, 1), and (1, 2)

*October 11, 2016*

**HELP ME PLEASE I NEED HELP history**

Why did Congress decide the election of 1800? Select two a. based on the outcome, it was mandated by the us consitutuion *** b. the popular vote was a tie c. no candidate won the electoral vote d: not enough citizens voted to determine the outcome ***

*October 10, 2016*

**SOCIAL STUDIES (CHECK ANSWERS PLEASE)**

do you know if #6 is right have you submitted it yet

*October 7, 2016*

**SOCIAL STUDIES (CHECK ANSWERS PLEASE)**

im stuck on this also do you know any of the answers pls answer

*October 7, 2016*

**Physics (PLEASE HELP PRONTO)**

A cart with a mass of 5.35 kg is placed on a frictionless ramp at an angle of 14.2. The cart is released and rolls down the ramp. Find the acceleration.

*October 7, 2016*

**C++**

It won't compile because it's saying the second "else if" isn't valid. I have tried changing things around and the best I can get is when I enter a value starting with"A" it returns nothing and a value starting with "B" returns and ...

*October 6, 2016*

**C++**

I am trying to create a program that displays shipping charges for two region codes. The region code has to have exactly 3 characters (the letter A or B followed by two numbers). Display a message if invalid region code is entered. use a sentinel value to exit program. ...

*October 6, 2016*

**science**

we need to see the answers

*October 6, 2016*

**art**

Please link the art or I cannot help you.

*October 5, 2016*

**Social Studies**

Were these answers right????

*October 3, 2016*

**Health**

Lyssey likes to bully others here and she is wrong. Your answers aren't all wrong.

*October 3, 2016*

**Math**

thank you so much!

*October 3, 2016*

**Math**

oh wait!! is it 9?!

*October 3, 2016*

**Math**

[(8^2 - 4) - 6] / 6 = ?? i think it's 59?? idk what the brackets mean. can someone PLEASE explain this to me???

*October 3, 2016*

**Physics**

A 300kg bobsled starts down an icy slope inclined at 12 degrees. There is some friction between the bobsled and the slope. If the hill is 200m long, how long does it take for the sled to reach the bottom?

*October 2, 2016*

**Physics**

A 300kg bobsled starts down an icy slope inclined at 12 degrees. There is some friction between the bobsled and the slope. Write the equations of motion in the two directions where the x axis is along the hillside.

*October 2, 2016*

**English**

yea i need help on this too someone help

*September 30, 2016*

**American Government**

can confirm, it is C

*September 29, 2016*

**Social Studies**

what was the flaw in the act passed by congress that established a tax on whiskey? a. it rewarded farmers who grew corn b. it did not spread the tax burden evenly** c. it was similar to taxes britan had proposed d. it had to be collected in person by tax collectors

*September 29, 2016*

**world history**

omg 100%

*September 28, 2016*

**Math please help!!!**

Julia is allowed to watch no more than 5 hours of television a week. So far this week, she has watched 1.5 hours. Write and solve an inequality to show how many hours of television Julia can still watch this week.

*September 26, 2016*